Which waste products result from the breakdown of proteins in animals?
What will be an ideal response?
ANSWER: Proteins are broken down to the nitrogen containing molecules of ammonia, urea or uric
acid and excreted. The particular molecule or combination of molecules depends on a
balance among toxicity, water conservation, and energy requirements.
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Increases in leptin levels will ____ appetite and _____ metabolic rate.
A. decrease, increase B. decrease, decrease C. increase, increase D. increase, decrease E. increase, not change
The chlorophyll molecule has a porphyrin ring that contains a single atom of:
a. manganese. b. magnesium. c. phosphorus. d. nitrogen. e. iron.
The person who performed an experiment that proved that amino acids could be produced in the laboratory from a reducing atmosphere and electrical sparks was
A. Stanley Miller. B. Graham Cairns-Smith. C. Thomas Cech. D. Aleksander Oparin. E. Sidney Fox.
Which of the following is not one of the four types of taste?
Select one: a. salty b. hot c. sour d. sweet e. bitter